I have good luck, I guess... And a safe pasture (IMO). In hotwire (the thin aluminum type that snaps if something runs into it), with capped Tposts, I have never had an injury- not even a scratch. That's in 4 years, with several different horses. I think that it's a combination of my making things as safe as possible, and Murphy's law. If i had beautiful board fence, I'd probably have tons of injuries, just because. LOL.